CN201590668U - Charging device for mobile terminal - Google Patents

Charging device for mobile terminal Download PDF

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Publication number
CN201590668U
CN201590668U CN200920220005XU CN200920220005U CN201590668U CN 201590668 U CN201590668 U CN 201590668U CN 200920220005X U CN200920220005X U CN 200920220005XU CN 200920220005 U CN200920220005 U CN 200920220005U CN 201590668 U CN201590668 U CN 201590668U
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CN
China
Prior art keywords
circuit
voltage
charging
battery
control
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CN200920220005XU
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Chinese (zh)
Inventor
朱东堂
王俊鹏
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中兴通讯股份有限公司
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Priority to CN200920220005XU priority Critical patent/CN201590668U/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00Reducing energy consumption in communication networks
    • Y02D30/70Reducing energy consumption in communication networks in wireless communication networks

Abstract

The utility model discloses a charging device for a mobile terminal. The charging device comprises a charging management IC and a battery circuit arranged outside the charging management IC, wherein a control circuit, a current limiting circuit, a voltage step-down circuit, a pre-charging circuit and a drive circuit are integrated on the charging management IC; the battery switch is used for charging a battery and controlling the discharging path of the battery and is controlled by the drive circuit of the charging management IC to keep in an off or on state or a semi-conducting state; and the control circuit has the function of battery voltage detection, and can control other module circuits in the charging management IC according to the detected battery voltage so as to achieve charging and discharging management of the battery. The control circuit is simultaneously controlled by a mobile terminal processor, and outputs information to the mobile terminal processor. By arranging the battery switch outside, the charging device can effectively lower the cost while achieving the similar power path management function.

Description

A kind of charging device that is used for portable terminal
Technical field
The utility model belongs to the mobile communication power supply technical field, relates in particular to a kind of battery charger of used for mobile terminal.
Background technology
Along with developing rapidly of mobile communication technology, mobile phone has become an indispensable part in people's life.Mobile phone popular more and more general, thus cell phone manufacturer also begin to pay attention to improving the mobile phone ease for use, with user-friendly.
At present, most of mobile phones all adopt charging technique shown in Figure 1.Because battery is with the cell phone system parallel connection, so when cell voltage is low, as 2.5V, even if the user inserts mobile phone with charger, because cell phone system generally requires voltage to be higher than more than the 3.0V and just can start, cell phone system still can't start immediately, thereby can't point out the charged state of user mobile phone.Charging when cell voltage is low, battery will be in precharging state at the beginning, this moment, charging current was little, rate of voltage rise is slow, the LCD of mobile phone (Liquid Crystal Display, liquid crystal display) screen will have a long period and be in the blank screen state, rise to the start voltage of cell phone system up to cell voltage after, mobile phone just can show the charging icon on the LCD screen, the charged state of prompting user mobile phone.
Vary in size according to battery capacity, cell voltage and charging current, the time length of mobile phone blank screen is not quite similar, sometimes even can reach more than 1 minute.Though the user has correctly connected charger and mobile phone, mobile phone is but without any prompting, and this probably can bring misunderstanding to the user, thinks that mobile phone, battery or charger damage by mistake, and it is correct to think that perhaps charger does not connect by mistake.Thus, bring relatively poor user experience.
In order to solve this user experience problem, in the cell-phone charging improvement project, a kind of scheme that has the power source path management function has appearred.In this scheme, charge management circuit has two outputs, and one connects cell phone system, and one connects battery.When mobile phone inserted charger, charge management circuit can be to the cell phone system conveying capacity, simultaneously to battery charge.This charging scheme has two advantages: one is after battery is filled, and mobile phone can directly use the charger power supply, thus the unlatching recharging of avoiding battery to repeat, extending battery life; Another one is that when cell voltage was very low, behind the insertion charger, cell phone system can start immediately, improves user experience.
General, the charging scheme that has a power source path management function as shown in Figure 2.Charge management circuit is integrated in the integrated circuit usually, and wherein cell switch uses MOS (metaloxide semicondutor, the metal-oxide semiconductor (MOS)) pipe of utmost point low on-resistance (Rdson).Because when not having charger, battery is powered to mobile phone by switch, if Rdson is excessive, will consume too much electric energy on switch, influences the stand-by time and the air time of mobile phone.In integrated circuit technology, the needed area of metal-oxide-semiconductor of the low Rdson of design is very big, so the charging IC cost height that designs by this method, can't extensive use.
The utility model content
Technical problem to be solved in the utility model is, overcomes the high problem of charging IC cost that has the power source path management function in the existing cell-phone charging technology, and a kind of charging device that is used for portable terminal is provided.This charging device can be realized similar power source path management function, but can significantly reduce cost.
For solving the problems of the technologies described above, the charging device that is used for portable terminal that the utility model proposes comprises Charge Management IC that is integrated with control circuit, current-limiting circuit, reduction voltage circuit, precharging circuit and drive circuit and the cell switch that is placed on this Charge Management IC.
Described cell switch is used for the path control to the terminal system discharge of the charging of battery and battery, be subjected to the control of the drive circuit among the described Charge Management IC be in by or conducting state.
Described control circuit has the battery voltage detection function, and other each modular circuit among the described Charge Management IC is controlled according to detected cell voltage situation, realize the charging and the discharge management of battery, accept the control of mobile terminal processor simultaneously, and to mobile terminal processor output information.Described current-limiting circuit is subjected to the control of described control circuit, and input current is limited.Described reduction voltage circuit is subjected to the control of described control circuit, charger voltage is dropped to the voltage that is fit to battery charge.Described precharging circuit is subjected to the control of described control circuit, realizes the little pre-charge to battery.Described drive circuit is subjected to the control of described control circuit, and described cell switch is carried out switch control.
Described control circuit can be regulated the size of charging current, opens or the charge closing function, and the relevant parameter of charging is set.
As a kind of preferred version, the minimum output voltage of described reduction voltage circuit is not less than the minimum voltage that makes that terminal system starts, and in the time of can guaranteeing the charging beginning like this, even if cell voltage is low excessively, terminal system still can access power supply.
In the prior art, need the integrated battery switch among the path management charging IC, and cell switch needs extremely low conducting resistance.In order to realize such cell switch, just need bigger silicon area, also just increased the cost of charging IC.And metal-oxide-semiconductor independently owing to adopted different technology, when having guaranteed extremely low Rdson, can also reach lower cost.The utility model is external with cell switch, when having realized similar power source path management function, provides cost savings effectively, and cost can approach the level of at present common charging IC.
Description of drawings
Fig. 1 is the charging circuit schematic diagram of existing common charging device;
Fig. 2 is the charging circuit schematic diagram of the charging device of existing charged source path management;
Fig. 3 is the charging circuit schematic diagram of the utility model first embodiment charging device;
Fig. 4 is to use a kind of charging process schematic diagram of the utility model first embodiment charging device;
Fig. 5 is to use the another kind of charging process schematic diagram of the utility model first embodiment charging device;
Drive circuit schematic diagram when Fig. 6 is the utility model charging device cell switch half conducting state;
Fig. 7 is the protective circuit schematic diagram in the utility model charging device reduction voltage circuit;
Fig. 8 is the charging circuit schematic diagram of the utility model second embodiment charging device;
Fig. 9 is to use a kind of charging process schematic diagram of the utility model second embodiment charging device.
Embodiment
For further setting forth the utility model is to reach technological means and the effect that predetermined purpose is taked, and below in conjunction with drawings and Examples, the charging device that is used for portable terminal that the utility model proposes is described in detail as follows.
Embodiment 1:
As shown in Figure 3, the charging device of present embodiment specifically comprises Charge Management IC that is integrated with control circuit, current-limiting circuit, reduction voltage circuit, precharging circuit and drive circuit and the cell switch that is placed on this Charge Management IC.The charger input current is successively through entering terminal system behind current-limiting circuit and the reduction voltage circuit; Battery and cell switch are received in the output of precharging circuit respectively; Cell switch is connected between battery and the terminal system.Also exemplarily provided in the prior art a kind of in the multiple common circuit connecting mode among Fig. 3.Such as, the Voltage Feedback point that drive circuit is also received in the output of reduction voltage circuit uses as Voltage Feedback, this is needs when cell switch is operated in half conducting state only, can certainly feed back by other signal, as long as feedback signal can reflect the variation of output voltage; The input of precharging circuit is received between current-limiting circuit and the reduction voltage circuit according to common way, can certainly directly connect charger and import or be connected to after the reduction voltage circuit; The battery voltage detection point of control circuit can also connect other positions, as long as situation that can reaction cell voltage.Control relation between each modular circuit is as follows:
Control circuit is responsible for the control of other all modular circuits among the Charge Management IC, realize the charging and the discharge management of battery, accept the control of mobile terminal processor simultaneously, can regulate the size of charging current, open or the charge closing function, perhaps carry out the relevant parameter setting of some other chargings.And control circuit can also may comprise the size of input current, the state of charging, state of charger or the like to mobile terminal processor output information.Simultaneously, control circuit also includes the battery voltage detection function, can detect the voltage of battery.
Current-limiting circuit is controlled the control of circuit, and input current is limited.In the present embodiment, for simplified design, this current-limiting circuit has been designed to M shelves electric current option, and M is a positive integer, and value is between 2~10 usually.The electric current option can be controlled by the logic line of necessary amount, as get M and equal 4, the electric current option specifically is arranged to 0mA, 100mA, 500mA and 1000mA etc., then can control with two logic line, represent 0mA as ' 00 ', ' 01 ' represents 100mA etc.
Reduction voltage circuit drops to the voltage that is fit to battery charge according to the control of control circuit with charger voltage, can realize by different modes such as linearity or DC-DC modes.In the present embodiment, reduction voltage circuit is realized step-down by the mode of Voltage Feedback.Reduction voltage circuit can promptly not done any restriction to the electric current and the voltage of output, directly with input and output UNICOM by the all-pass mode that realizes is set according to the suitable voltage of control output of control circuit yet.Reduction voltage circuit also can adopt the way of similar current-limiting circuit, controls by logic line, represents all-pass as ' 00 ', and ' 01 ' represents output voltage 3.4V etc.
Precharging circuit is realized the little pre-charge electricity to battery according to the control of control circuit, generally is to carry electric current in the mode of constant-current source to battery.Control circuit is similar with current-limiting circuit and reduction voltage circuit to the control method of precharging circuit, and the size of preliminary filling electric current can be the control that is controlled circuit, can be the current value of fixing also, and as 40mA, precharging circuit can the output of Be Controlled circuit close current.
Drive circuit is accepted the control of control circuit, and cell switch is carried out switch control, in the prior art multiple implementation can be arranged, even can be simplified to a logic line.
Cell switch is used for battery charge and battery are controlled to the path of terminal system discharge.It is activated the control of circuit, opens or closes.
Charging device can have several different working stages according to the difference of cell voltage when battery is charged.Control circuit is discerned different states by judging cell voltage, according to the difference of state other modular circuit is controlled.
Easy in order to narrate, below represent cell voltage with Vbat; Represent charger voltage with Vcharge; Represent the output voltage of reduction voltage circuit with Vsys, this voltage also is the terminal system power supply; Represent the pre-charge pressure thresholding of battery with Vpre_charge, when Vbat≤Vpre_charge, battery should use the less current charging, for the preferred 2.8V of lithium battery; With the minimum voltage that the Vsys_power_up representative makes the terminal system startup, when the power supply of terminal system was higher than Vsys_power_up, the software of terminal system just can normally move, generally speaking Vsys_power_up>Vpre_charge; With the highest withstand voltage of Vsys_max GC group connector system, when the terminal system power supply was higher than Vsys_max, terminal system will be damaged because of overtension; Represent the charging voltage in constant voltage charge stage with Vcv, this voltage of lithium battery is generally 4.2V; Represent the charging circuit input current with Iin; Represent charging to finish electric current with Iterm, i.e. during lithium battery constant voltage charging, charging current is then charged less than this value and is finished.
In order to guarantee that cell voltage crosses when low, terminal system still can access power supply, and require Vsys 〉=Vsys_power_up this moment, and the minimum output voltage of establishing reduction voltage circuit is Vsys_min, and Vsys_min 〉=Vsys_power_up.Next be example with the lithium cell charging, introduce each stage of charging in detail, as shown in Figure 4.
Phase I: promptly during Vbat<Vsys_min.
At this moment, cell switch is in open mode, and promptly cut-off state makes terminal system disconnect with battery; Precharging circuit is to battery output preliminary filling electric current, and the size of preliminary filling electric current can be predefined fixed value, also can be controlled by control circuit, generally by the mobile terminal processor setting; Voltage Vsys 〉=the Vsys_power_up of reduction voltage circuit output.In order to reduce the power consumption of reduction voltage circuit, preferred, Vsys should be as much as possible near Vcharge, and promptly Vsys should be high as much as possible, but need to guarantee Vsys<Vsys_max, exportable Vcv.Current-limiting circuit can be limited input current according to the charging current size of mobile terminal processor setting, also can not limit input current;
When cell voltage rises to Vsys_min, enter second stage.
Second stage: promptly during Vsys_min≤Vbat<Vcv.
At this moment, current-limiting circuit is limited input current according to the charging current size that mobile terminal processor is provided with; Cell switch is in closure state, and promptly conducting state makes terminal system and battery couple together by cell switch; Precharging circuit is closed, promptly no longer to battery output pre-charge current; Reduction voltage circuit is in the all-pass state.
When cell voltage rises to Vcv, enter the phase III.
Phase III: promptly during Vbat=Vcv.
At this moment, cell switch is in closure state, i.e. conducting state; Precharging circuit is closed; Reduction voltage circuit constant voltage output Vcv.Current-limiting circuit can be limited input current according to the charging current size of mobile terminal processor setting, also can not limit input current;
When Iin<Iterm, charging finishes.
Adopt State Control as above just can guarantee any moment, especially during Vbat<Vsys_power_up, the voltage of reduction voltage circuit output all is higher than Vsys_power_up, make when Vbat voltage is low, the terminal system of inserting charger can obtain power supply immediately, start software, prompting user charged state.
Should be appreciated that each the stage control in the above-mentioned charging process can be separate.Wherein, the control of phase I is closely-related with the utility model, and what the control in other each stages was all adopted is prior art, can certainly adopt other control modes of the prior art.
In the lithium battery applications system, Vpre_charge is generally 2.8V, and Vsys_power_up is generally 3.4V, and when Vpre_charge<Vbat<Vsys_power_up, adopted pre-charge current to charge, this electric current is far below the charging current in constant current charge stage, because the capacity of lithium battery is bigger, so such way has influenced the raising of charging rate.In order to improve the charging rate of lithium battery, can charge to battery by following four-stage, as shown in Figure 5:
Stage A: promptly during Vbat<Vpre_charge.
At this moment, charging device, is not repeated with the above-mentioned phase I in the working method in this stage herein.
When cell voltage rises to Vpre_charge, enter stage B.
Stage B: promptly during Vpre_charge≤Vbat<Vsys_min.
At this moment, reduction voltage circuit works in the all-pass state; Cell switch need be in half conducting state, and drive circuit makes Vsys 〉=Vsys_min by the conducting resistance of control cell switch, and is preferred, Vsys=Vsys_min.Current-limiting circuit can be limited input current according to the charging current size of mobile terminal processor setting, also can not limit input current.Cell switch is in half conducting state, is equivalent to a switch that conducting resistance is arranged.In the utility model, cell switch needs lower conducting resistance, generally requires less than 100mohm.In the present embodiment, what cell switch adopted is the metal-oxide-semiconductor of P raceway groove, and Charge Management IC turn-offs or the conducting metal-oxide-semiconductor by the grid voltage of control metal-oxide-semiconductor, perhaps makes metal-oxide-semiconductor be operated in the variable resistor district, i.e. half conducting state.
After cell voltage rose to Vsys_min, the working method of charging device was not repeated with above-mentioned second, third stage herein.Equally, each the stage control in the charging process can be separate.Adopt stage control as above just can guarantee any moment, especially during Vbat<Vsys_power_up, the voltage of reduction voltage circuit output all is higher than Vsys_power_up, make when Vbat voltage is low, insert the charger terminal system and can obtain power supply immediately, start software, prompting user charged state, but also can guarantee charging rate faster.
In the above-mentioned charging process, cell switch not only needs to be operated in conducting or ends under the two states, also need to be operated under half conducting state, the control of suggestion cell switch adopts the voltage negative feedback control circuit to realize under this situation, describe as preamble, generally the output of reduction voltage circuit is introduced as feedback signal, can certainly be by introducing the function of other coherent signals realization signal feedback in the reduction voltage circuit, as long as feedback signal can reflect the output situation of reduction voltage circuit.As shown in Figure 6, it is high more to suppose that voltage negative feedback control circuit wherein inputs to the voltage of cell switch, and its conducting resistance is big more; And input voltage is low more, and conducting resistance is more little.During the work of voltage negative feedback control circuit, Vf=Vref, sample circuit can make the proportionate relationship that Vf and Vsys become to fix, as Vf=Vsys/n, then Vsys can be stabilized in voltage nVref, suitably chooses n and Vref and just can make stable certain voltage that keeps of Vsys, in order to reduce the power consumption of external cell switch, general Vsys is low more good more, preferred Vsys_min.
When not having battery or battery to damage; require reduction voltage circuit to be in the all-pass state; but the output of Vsys might be too high; even can be higher than Vsys_max; prevent the protective circuit that output voltage is too high so the utility model also advises being provided with in reduction voltage circuit, make the voltage of its output surpass Vsys_max never.This protective circuit can adopt the voltage negative feedback control circuit to realize.As shown in Figure 7, suppose that the input voltage of wherein step-down adjustment pipe is high more, its conducting resistance is more little; Input voltage is low more, and conducting resistance is big more.When not having battery, the voltage negative feedback control circuit works, Vf=Vref, sample circuit makes the proportionate relationship that Vf and Vsys become to fix, as Vf=Vsys/n, then Vsys meeting regulated output voltage nVref suitably chooses n and Vref and just can guarantee that Vsys can not surpass Vsys_max.
Embodiment 2:
The circuit module of present embodiment charging device and control relation and previous embodiment similar, different is, and cell switch adopts is the metal-oxide-semiconductor of N raceway groove.As shown in Figure 8, successively through entering terminal system behind current-limiting circuit and the reduction voltage circuit, anode is also received in the output of reduction voltage circuit to the charger input current; Battery cathode and cell switch are received in the output of precharging circuit; Battery is connected between cell switch and the terminal system, and battery cathode connects cell switch; Cell switch and Charge Management IC be ground connection respectively.Similar to Example 1, also exemplarily provided in the prior art a kind of in the multiple common circuit connecting mode among Fig. 8.Such as, the voltage detecting end that control circuit is received in the output of reduction voltage circuit uses as Voltage Feedback, this is needs when cell switch is operated in half conducting state only, can certainly feed back by other signal, as long as feedback signal can reflect the variation of output voltage; The control end of precharging circuit is received control circuit.Like this, cell voltage Vbat equals reduction voltage circuit output voltage V sys and deducts cell switch voltage Vswitch, can certainly detect the voltage of battery by other modes, and the present invention does not limit.
Referring to Fig. 9, the charging process of present embodiment charging device and previous embodiment similar specifically comprises following three phases:
Phase I: promptly during Vbat<Vsys_min.
At this moment, cell switch is in open mode, and promptly cut-off state makes terminal system disconnect with battery; Precharging circuit is pulled out the preliminary filling electric current from battery, and the size of electric current is controlled by control circuit, generally by the mobile terminal processor setting; Voltage Vsys>the Vsys_power_up of reduction voltage circuit output.In order to reduce the power consumption of reduction voltage circuit, preferred, Vsys should be as much as possible near Vcharge, and promptly Vsys should be high as much as possible, but need to guarantee Vsys<Vsys_max, exportable Vcv.Current-limiting circuit can be limited input current according to the charging current size of mobile terminal processor setting, also can not limit input current.
When cell voltage rises to Vsys_min, enter second stage.
Second stage: promptly during Vsys_min≤Vbat<Vcv.
At this moment, current-limiting circuit is limited input current according to the charging current size that mobile terminal processor is provided with; Cell switch is in closure state, and promptly conducting state makes terminal system and battery couple together by cell switch; Precharging circuit is closed, and promptly no longer pulls out pre-charge current from battery; Reduction voltage circuit is in the all-pass state.
When cell voltage rises to Vcv, enter the phase III.
Phase III: promptly during Vbat=Vcv.
At this moment, cell switch is in closure state, i.e. conducting state; Precharging circuit is closed; Reduction voltage circuit constant voltage output Vcv.Current-limiting circuit can be limited input current according to the charging current size of mobile terminal processor setting, also can not limit input current.
When Iin<Iterm, charging finishes.
Adopt State Control as above just can guarantee any moment, especially during Vbat<Vsys_power_up, the voltage of reduction voltage circuit output all is higher than Vsys_power_up, make when Vbat voltage is low, the terminal system of inserting charger can obtain power supply immediately, start software, prompting user charged state.Certainly, in order to realize charging rate faster, also can adopt the quadravalence section charging process among similar first embodiment.Equally, each the stage control in the charging process can be separate.
Explanation by above-mentioned embodiment, when can being to reach technological means and the effect that predetermined purpose takes to be able to more deeply and concrete understanding to the utility model, yet embodiment and appended diagram only provide with reference to the usefulness of explanation, be not to be used for the utility model is limited.The convenience in order to narrate just such as, several function module circuits in the charging device is the division of carrying out according to the different people of function of each module.Certainly, also can integrate each module, even split, as long as guarantee still to comprise the function and the annexation of above each module through the module after the splitting and reorganizing according to actual conditions.

Claims (10)

1. a charging device that is used for portable terminal is characterized in that comprising Charge Management IC that is integrated with control circuit, current-limiting circuit, reduction voltage circuit, precharging circuit and drive circuit and the cell switch that is placed on described Charge Management IC;
Described cell switch is used for the path control to the terminal system discharge of the charging of battery and battery, be subjected to the control of the drive circuit among the described Charge Management IC be in by or conducting state;
Described control circuit has the battery voltage detection function, and other each modular circuit among the described Charge Management IC is controlled according to detected cell voltage situation, realize the charging and the discharge management of battery, accept the control of mobile terminal processor simultaneously, and to mobile terminal processor output information;
Described current-limiting circuit is subjected to the control of described control circuit, and input current is limited; Described reduction voltage circuit is subjected to the control of described control circuit, charger voltage is dropped to the voltage that is fit to battery charge; Described precharging circuit is subjected to the control of described control circuit, realizes the little pre-charge to battery; Described drive circuit is subjected to the control of described control circuit, and described cell switch is carried out switch control.
2. charging device according to claim 1 is characterized in that, the minimum output voltage of described reduction voltage circuit is not less than the minimum voltage that makes that terminal system starts.
3. charging device according to claim 1 is characterized in that, described cell switch adopts the metal-oxide-semiconductor of P raceway groove; The charger input current is successively through entering terminal system behind described current-limiting circuit and the described reduction voltage circuit; Battery and described cell switch are received in the output of described precharging circuit respectively; Described cell switch is connected between battery and the terminal system.
4. charging device according to claim 1 is characterized in that, described cell switch adopts the metal-oxide-semiconductor of N raceway groove; Successively through entering terminal system behind described current-limiting circuit and the described reduction voltage circuit, anode is also received in the output of described reduction voltage circuit to the charger input current; Battery cathode and described cell switch are received in the output of described precharging circuit; Battery is connected between described cell switch and the terminal system, and battery cathode connects described cell switch; Described cell switch and described Charge Management IC be ground connection respectively.
5. according to each described charging device in the claim 1 to 4, it is characterized in that described current-limiting circuit is provided with M shelves electric current option, M is a positive integer.
6. charging device according to claim 5 is characterized in that, described each grade electric current option is controlled by the logic line of necessary amount.
7. according to each described charging device in the claim 1 to 4, it is characterized in that described cell switch also can be in half conducting state under the control of described drive circuit, what described drive circuit adopted is the voltage negative feedback control circuit.
8. according to each described charging device in the claim 1,2,3,4 and 6, it is characterized in that, be provided with the protective circuit that prevents that output voltage is too high in the described reduction voltage circuit.
9. charging device according to claim 8 is characterized in that, when cell voltage during less than the minimum output voltage of described reduction voltage circuit, described cell switch is in cut-off state; Described precharging circuit is to battery output preliminary filling electric current; The output voltage of described reduction voltage circuit is not less than the minimum voltage that makes that terminal system starts.
10. charging device according to claim 7 is characterized in that, if the pre-charge pressure thresholding of battery rises at cell voltage before the pre-charge pressure thresholding of battery less than the minimum voltage that makes that terminal system starts, described cell switch is in cut-off state; Described precharging circuit is to battery output preliminary filling electric current; The output voltage of described reduction voltage circuit is not less than the minimum voltage that makes that terminal system starts;
When cell voltage is not less than the pre-charge pressure thresholding of battery but before reaching the minimum output voltage of described reduction voltage circuit, described reduction voltage circuit works in the all-pass state; Described cell switch is in half conducting state; Described drive circuit makes the output voltage of described reduction voltage circuit be not less than the minimum output voltage of described reduction voltage circuit by the conducting resistance of control cell switch.
CN200920220005XU 2009-10-22 2009-10-22 Charging device for mobile terminal CN201590668U (en)

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CN102480150A (en) * 2010-11-29 2012-05-30 株式会社东芝 Charging control device and charging control system
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CN105052001A (en) * 2012-09-18 2015-11-11 谷歌技术控股有限责任公司 Method and apparatus for improving cycle life capacity of a battery pack
CN105207337A (en) * 2015-09-02 2015-12-30 昆山龙腾光电有限公司 Electronic device
CN105322597A (en) * 2015-03-25 2016-02-10 维沃移动通信有限公司 Charging circuit and mobile terminal
CN106410903A (en) * 2016-10-24 2017-02-15 上海与德信息技术有限公司 Mobile terminal charging state prompting method and device
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CN109787349A (en) * 2019-03-01 2019-05-21 普联技术有限公司 A kind of UPS circuit, power circuit and electronic equipment

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CN105052001B (en) * 2012-09-18 2019-06-11 谷歌技术控股有限责任公司 Method and apparatus for improving the cycle life capacity of battery pack
CN105052001A (en) * 2012-09-18 2015-11-11 谷歌技术控股有限责任公司 Method and apparatus for improving cycle life capacity of a battery pack
CN103078369A (en) * 2012-12-27 2013-05-01 青岛歌尔声学科技有限公司 Insufficient voltage activating device for lithium battery
CN103078369B (en) * 2012-12-27 2015-09-09 青岛歌尔声学科技有限公司 Lithium battery power shortage active device
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CN104333094B (en) * 2014-11-21 2017-03-15 捷开通讯(深圳)有限公司 A kind of charging current control method and system based on mobile terminal
CN104333094A (en) * 2014-11-21 2015-02-04 惠州Tcl移动通信有限公司 Charging current control method and system based on mobile terminal
CN105322597B (en) * 2015-03-25 2018-09-04 维沃移动通信有限公司 A kind of charging circuit and mobile terminal
CN105322597A (en) * 2015-03-25 2016-02-10 维沃移动通信有限公司 Charging circuit and mobile terminal
CN104993182A (en) * 2015-08-05 2015-10-21 青岛海信移动通信技术股份有限公司 Mobile terminal, direct charging power adapter and charging method
US10044217B2 (en) 2015-08-05 2018-08-07 Hisense Mobile Communications Technology Co., Ltd. Mobile terminal, DC-charging power source adaptor, and rapid charging method
US10050466B2 (en) 2015-08-05 2018-08-14 Hisense Mobile Communications Technology Co., Ltd. DC-charging power source adaptor and mobile terminal
US10050460B2 (en) 2015-08-05 2018-08-14 Hisense Mobile Communications Technology Co., Ltd. Mobile terminal, DC-charging power source adaptor, and charging method
US10110038B2 (en) 2015-08-05 2018-10-23 Hisense Mobile Communications Technology Co., Ltd. Mobile terminal and rapid charging method
US10097022B2 (en) 2015-08-05 2018-10-09 Hisense Mobile Communications Technology Co., Ltd. Mobile terminal and rapid charging method
CN105207337A (en) * 2015-09-02 2015-12-30 昆山龙腾光电有限公司 Electronic device
CN106410903A (en) * 2016-10-24 2017-02-15 上海与德信息技术有限公司 Mobile terminal charging state prompting method and device
CN109787349A (en) * 2019-03-01 2019-05-21 普联技术有限公司 A kind of UPS circuit, power circuit and electronic equipment

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